Democratic Sentinel, Volume 18, Number 35, Rensselaer, Jasper County, 14 September 1894 — Confined Sound. [ARTICLE]

Confined Sound.

The intensity of confined sound is illustrated at Carisbrook CaStle, Isle of Wight, where there is a well 200 feet deep and 12 feet in diameter, lined with smooth masonry. When a pin is dropped into it, the sound of it striking the surface of the water, 182 feet below, can be distinctly beard.